class Solution(object):
    def flipEquiv(self, root1, root2):
        if not root1 and not root2:
            return True
        if not root1 or not root2:
            return False
        if root1.val != root2.val:
            return False
        return (self.flipEquiv(root1.left, root2.left) and self.flipEquiv(root1.right, root2.right)) or (
                    self.flipEquiv(root1.left, root2.right) and self.flipEquiv(root1.right, root2.left))

